std::runtime_error on std::locale("")

[Takashi Yano via Cygwin]

I wonder why the following code throws std::runtime_error
even though the LC_ALL is set to valid locale other than "C".
This does not occur only when LC_ALL is set to "C".

#include <locale>
int main()
{
        std::locale("");
        return 0;
}

In linux, this occurs only when the LC_ALL is set to invalid
locale (i.e. locale that is not registered in system).

Any idea?

-- 
Takashi Yano <takashi.y...@nifty.ne.jp>

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